1. The problem statement, all variables and given/known data 2. Relevant equations x = x₀cos(wt) (or x = -x₀cos(wt) , depending on the graph shape) x = x₀sin(wt) ω = 2π / T 3. The attempt at a solution I am confused as I have never encountered any oscillatory object with a thickness. Because if I take the middle of the pathway to be the equilibrium point, the middle of the blade would not touch the ceiling/floor of the pathway, so it can't be considered as a full oscillation. Which was why I assumed the oscillating object was a 'line', and split the 0.4m blade into 2 'blocks' of 0.4m on the top and bottom of the pathway What did I do wrong?